I'm going to try out the wiimote and nunchuk in single player, but use the gamecube controller online.

Thats not a good idea, because if you practice entirely on one controller, you will be very good at it. If you vary between controllers, you won't be your best at both of them.

GC Controller and Classic Controller are the best, only bad thing is that Classic Controller is much too small, making it awkward for some players.

GC Controller is the easiest, best controller for Brawl.

WM+N and WM are bad controllers because SSBB requires fast movements and reflexes, and the buttons on the WM are MUCH to far apart. Also, to preform the final smash, you need to shake your nunchuk in that direction, and you can easily mess up doing this. Also, for the WM alone... - and + are much to far away from your fingers and since you will be pushing buttons very fast, you will be pausing accidently half the time. Also, it is very difficult to press A+B at the same time since on the side, they are not equal.

I'm on the fence between Classic and GC. I quite like the GC controller and I've gotten so familiar with it... then again, I wouldn't mind trying the new Wii controller. The idea of holding 2 controllers doesn't appeal to me... nor does it seem efficient from what I've read. And holding the Wii-mote sideways seems kind of awkward. Either way, I'll try all methods just for fun, but most likely stick with GC or Classic.